De grtjyter



(No Model.)

P. A. L. DE GRUYTER. APPARATUS POR RAISING AND LOWERING BOATS.

N0.140'7,892. v i Patented July 30, 1889.

UNTTED STATEs PATENT Omnium FERDINAND ARNOLD LUDVIG DE GRUYTER, OIFAMSTERDAM, HOLLAND.

APPARATUS FOR RAISING AND LOWERING BOATS.

SPECIFICATION forming part of Letters Patent No. 407,892, dated July 30,1889.

.Application led July 24, 1888. Serial No. 280,984l (No model.) Patentedin England May 24, 1888,1To. 7,681; in France June 25, 1888, No.191,415; in Sweden July 2, 1888,1To. 1,582 i in Norway July9,1888,No.1,028; in Belgium July 10,1888, No. 82,514; in Italy September8 0, 1888, XLVII, 119 5 in Spain October 2, 1888, No. 8,482; inAustria-Hungary October 26, 1888, No. 80,047, and in GanadaNovember2,1888, N0.80,081.

To all whom t may concern:

Be it known that I, FERDINAND ARNOLD' LUDWIG DE GRUYTER, a subject ofthe King of Holland, residing at Amsterdam, in the Kingdom of Holland,have invented Improvements in Apparatus for Raising and Lowering` ShipsBoats, (for which patents have been obtained in England, No. 7,631, May24, 1888; France, No. 191,415, June 25, 1888; Austria- Hungary, No.80,047, October 26, 1888; Sweden, No. 1,582, July 2, 1888; Norway, No.1,028, July 9, 1888; Belgium, No. 82,514, July 10, 1888; Spain, No.8,482, October 2, 1888; Canada, No. 80,081, November 2,1888, and Italy,Reg. A. IV. Vol. XLVII, No. 119, September 80, 1888,) of which thefollowing is a speciiication.

This invention has reference to novel constructions of apparatus forraising` and lowering ships boats, the object being to enable a shipsboat, even when equipped and manned, to be easily raised clear of thechocks or lowered onto them. For this purpose a screw arrangement isadapted to and used in combination with the tackle-blocks between thedavits and the boat, as I will now proceed to explain. At the upperextremities the davits are bifurcated, and each prong is recessed toreceive trunnions projecting from a block that is formed like a nut witha hole, with female screw-thread to receive a male screw, that isprovided with a handle or lever by which it can be turned. The upper orstanding7 block of the boat-lowering tackle is connected by aswivel-joint to the screw, which is provided with a head by which thesaid tackle is supported.

In order that the nature of my invention may be readily understood,reference is had to the accompanying sheet of illustrative drawings, inwhich- Figure 1 is an elevation of part of a davit with boat raising andlowering apparatus according to this invention suspended therefrom.Figs. 2 and 8 are respectively an elevation at right angle to Fig. 1 anda plan or top view of the davit and upper part of the apparatus.

1 is a part of adavit, bifurcated at its upper end. The prongs 2 therebyformed are each recessed, as shown, to form a bearing 4 is a blockformed with an internal screwthread to serve as a nut for ascrew-threaded rod 5. The said block is formed with trunnions 6, whichare journaled in the bearings 3 in such a manner that they may turntherein and permit the rod 5 to readily adjust itself to the strainthereon. The screw-threaded rod 5, which is provided with a hand-lever 7is connected by a swivel-joint 8 to the top of the upper block 9 oflowering tackle, that may be of ordinary kind, and which comprises apair of pulley-blocks, as shown. With this arrangement, by turning thehand-lever 7, and consequently the screw-threaded rod 5, a boatsuspended to the lower or running7 block will be raised or loweredaccording to the direction in which the screw is turned. Assuming aloaded boat to be on the chocks and each of two davits to be titted withapparatus of the kind hereinbefore described, if the two screws beturned simultaneously, the boat can be raised from the chocks. Then itcan be worked out and lowered over the ships side in the ordinary way,the nuts 4 turning when necessary in their bearings in the davits andpermitting the screw-threaded rods to adjust themselves in line with thepull of the lowering-tackle, and thereby preventing lateral strain onthe rods. l

When the apparatus is not in use, the handlever (or levers) may belocked in position in any convenient manner. It may be by a hook andchain connected with one ot the davits, as indicated in Eig. 2.

Vhat I claim is- 1. In apparatus for raising and lowering ships boats,the combination of a tackleblock, a screw-threaded rod connected to saidblock by a swivel, a correspondingly-threaded nut through which said rodworks, said nut being adapted to be pivotally connected to a support insuch a manner as to permit said rod to swing in a vertical plane, forthe purpose speciiied.

2. In apparatus for raising and lowering ships boats, the combination ofa davit,

a screw threaded rod, a .correspondingly threaded nut journaled to saiddavit, and through Which said rod extends and in relation to which saidrod is adapted to be turned, and lowering-tackle suspended from said rodby a swivel connection, substantially as herein described, for thepurpose specified.

3. In apparatus for raising and lowering ships boats, thecombination,with a davit, and a lowering-tackle, of a screw-threaded rodadapted to be turned about its axis, and a oorrespondingly-threaded nutor nuts journ aled to said davit, prevented from turning relatively tosaid rod and through which said rod Works, said lowering-tackle being`suspended from said rod by a swivel-joint, substantially as described,for the purpose specified.

In testimony WhereoI I have signed my name to this specification in thepresence of two subserbing Witnesses.

. FERDINAND ARNOLD LUDWIG DE GRUY'IER. Witnesses:

F. G. HANCOCK, P. DE Booz,

Both of Amsterdam.

